login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A175756 Numbers with 50 divisors. 2
6480, 9072, 14256, 16848, 22032, 24624, 29808, 30000, 37584, 40176, 41472, 47952, 53136, 55728, 60912, 68688, 70000, 76464, 79056, 86832, 92016, 94608, 101250, 102384, 107568, 110000, 115248, 115344, 125712, 130000, 130896, 133488 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers of the forms p^49, p^24*q^1, p^9*q^4 and p^4*q^4*r^1, where p, q and r are distinct primes.

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

OEIS Wiki, Index entries for number of divisors

FORMULA

A000005(a(n))=50.

MATHEMATICA

Select[Range[200000], DivisorSigma[0, #] == 50 &] (* Vladimir Joseph Stephan Orlovsky, May 04 2011 *)

PROG

(PARI) is(n)=numdiv(n)==50 \\ Charles R Greathouse IV, Jun 19 2016

CROSSREFS

Cf. A137484, A137488, A175750.

Sequence in context: A318629 A213117 A232410 * A190012 A087351 A104343

Adjacent sequences:  A175753 A175754 A175755 * A175757 A175758 A175759

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Aug 27 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 17 07:48 EDT 2019. Contains 328106 sequences. (Running on oeis4.)